| 摘要: |
| 针对宽带接收机接收信号多，且信号在频谱上呈现非均匀分布的情况，提出了基于多
相离散傅里叶变换(DFT)滤波器组和信号重建的高效非均匀数字信道化的设计方法。该数字
信道化结构由分析
和综合两部分组成，采用同一组原型滤波器系数，通过对原型低通滤波器的优化设计提高其
带外衰减性能，以利用平行结构正交镜像滤波器组重建信号。与常用的并行数字下变频、多
级多相DFT滤波器组两种非均匀数字信道化方法运算量比较，该方法在信号重建失真很小的
情况下具有高效性和可行性。 |
| 关键词: 宽带接收机 多相DFT 信号重建 数字信道化 |
| DOI： |
|
| 基金项目:国家重点基础研究发展规划（973计划）项目(2007CB310601)；
国家科技支撑计划项目(2008BAH25B03)；国家自然科学基金资助项目(61021001) |
|
| Efficient Non-uniform Digital Channelizer and Signal Reconstruction Technology |
| WANG Fang,HUANG Zhen,LU Jian-hua |
| (Department of Electronic Engineering,Tsinghua University, Beijing 100084,Chi
na;School of Aerospace, Tsinghua University, Beijing 100084,China) |
| Abstract: |
| In view of the situation that the number of receiving signal in wideband rece
iver is large and signal spectrum distributes non-uniformly, a method of effici
e
nt non-uniform digital channelizer based on polyphase filter banks and signal
r
e
construction is proposed in this paper. The digital channelizer is composed of b
oth analyser and synthesizer with a same coefficient of prototype low-pass filt
e
r, which is designed optimally to achieve high stopband attenuation, so that the
parallel quadrature mirror filter banks can be used to reconstruct signal. Fina
lly, the computational complexity of the proposed channelizer is compared with t
hat of t
he parallel digital down conversion channelizer and multi-stage polyphase DFT(D
iscret Fourier Transform) f
i
lter banks, it can be seen that the proposed method is more efficient and fe
asible with a little signal distortion. |
| Key words: wideband receiver polyphase DFT signal reconstruction digital channelizer |
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